SA twin killer cleared of murder charge

A South Australian man who killed his twin brother has been found not guilty by reason of mental incompetence.

Lucas Brian Timothy Cawte shot his brother Jake on a property at Willunga, south of Adelaide, in March last year.

In the South Australian Supreme Court on Thursday, Justice Kevin Nicholson ruled he was not mentally competent at the time, following a concession made last week by the Director of Public Prosecutions.

A court has previously heard Cawte shot his brother twice to stop him "going to God", and intended to take his own life but instead handed himself in to police.

Cawte appeared in court by video link from James Nash House, where his counsel earlier said he is in a "very stable" condition in a rehabilitation ward.

The court will now decide on the conditions of a licence for Cawte.

Justice Nicholson ordered two reports on his condition, and he will appear again in early December.